会话技术_Session_快速入门和会话技术_session原理分析

概念：服务器端会话技术，在一次会话的多次请求间共享数据，将数据保存在服务器的对象中。HttpSession

快速入门：

　　获取HttpSession对象：

　　　　HttpSession session = request.getSession();

　　　　使用HttpSession对象：

　　　　　　Object  getAttribute(String name)

　　　　　　void setAttribute（String name,Object value）

　　　　　　void   removeAttribute(String name)

 

 

@WebServlet("/SessionDemo1")
public class SessionDemo1 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        HttpSession session = request.getSession();

        session.setAttribute("msg","hello session");


    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

 

@WebServlet("/SessionDemo2")
public class SessionDemo2 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        HttpSession session = request.getSession();

        Object msg = session.getAttribute("msg");
        System.out.println(msg);


    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

 

 

 

 

 

 

 

 

 

 

Session原理”

　　Session的实现是依赖Cookie的

 

 

 

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